Before you start printing the OpenRC F1 that uses pockets to fit the small M3 nuts and see if you need to calibrate your printer for them to fit.
Even if this comes out good, make sure you test the m3 nuts in the first 3dprinted part aswell to be sure.
Cube d'étalonnage OpenRC
Swedish CadCam addict hooked on 3D printing.
3D Printing evangelist and Open Source advocate.
Author of The OpenR/C Project and The OpenRailway Project.